1 /* $OpenBSD: expand.c,v 1.15 2022/12/04 23:50:48 cheloha Exp $ */ 2 /* $NetBSD: expand.c,v 1.5 1995/09/02 06:19:46 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <ctype.h> 36 #include <unistd.h> 37 #include <err.h> 38 39 /* 40 * expand - expand tabs to equivalent spaces 41 */ 42 int nstops; 43 int tabstops[100]; 44 45 static void getstops(char *); 46 static void usage(void); 47 48 int 49 main(int argc, char *argv[]) 50 { 51 int c, column; 52 int n; 53 54 if (pledge("stdio rpath", NULL) == -1) 55 err(1, "pledge"); 56 57 /* handle obsolete syntax */ 58 while (argc > 1 && argv[1][0] == '-' && 59 isdigit((unsigned char)argv[1][1])) { 60 getstops(&argv[1][1]); 61 argc--; argv++; 62 } 63 64 while ((c = getopt (argc, argv, "t:")) != -1) { 65 switch (c) { 66 case 't': 67 getstops(optarg); 68 break; 69 default: 70 usage(); 71 /* NOTREACHED */ 72 } 73 } 74 argc -= optind; 75 argv += optind; 76 77 do { 78 if (argc > 0) { 79 if (freopen(argv[0], "r", stdin) == NULL) 80 err(1, "%s", argv[0]); 81 argc--, argv++; 82 } 83 column = 0; 84 while ((c = getchar()) != EOF) { 85 switch (c) { 86 case '\t': 87 if (nstops == 0) { 88 do { 89 putchar(' '); 90 column++; 91 } while (column & 07); 92 continue; 93 } 94 if (nstops == 1) { 95 do { 96 putchar(' '); 97 column++; 98 } while (((column - 1) % 99 tabstops[0]) != (tabstops[0] - 1)); 100 continue; 101 } 102 for (n = 0; n < nstops; n++) 103 if (tabstops[n] > column) 104 break; 105 if (n == nstops) { 106 putchar(' '); 107 column++; 108 continue; 109 } 110 while (column < tabstops[n]) { 111 putchar(' '); 112 column++; 113 } 114 continue; 115 116 case '\b': 117 if (column) 118 column--; 119 putchar('\b'); 120 continue; 121 122 default: 123 putchar(c); 124 column++; 125 continue; 126 127 case '\n': 128 putchar(c); 129 column = 0; 130 continue; 131 } 132 } 133 } while (argc > 0); 134 exit(0); 135 } 136 137 static void 138 getstops(char *cp) 139 { 140 int i; 141 142 nstops = 0; 143 for (;;) { 144 i = 0; 145 while (*cp >= '0' && *cp <= '9') 146 i = i * 10 + *cp++ - '0'; 147 if (i <= 0 || i > 256) { 148 bad: 149 errx(1, "Bad tab stop spec"); 150 } 151 if (nstops > 0 && i <= tabstops[nstops-1]) 152 goto bad; 153 if (nstops >= sizeof(tabstops) / sizeof(tabstops[0])) 154 errx(1, "Too many tab stops"); 155 tabstops[nstops++] = i; 156 if (*cp == 0) 157 break; 158 if (*cp != ',' && *cp != ' ') 159 goto bad; 160 cp++; 161 } 162 } 163 164 static void 165 usage(void) 166 { 167 extern char *__progname; 168 fprintf (stderr, "usage: %s [-t tablist] [file ...]\n", __progname); 169 exit(1); 170 } 171